忘記了的一個文法

-----You might be talking be' strong form;verb,auxiliary verb on irregular verbs:-
verb(linking verb is there + noun:-eg
To be argued----subject
,is there a God ?-------linking verb---------is there + a noun.Hence:-eg:-To be argued (,)is there a God?
Down the riverbank-----a phrase in inversion
(,)is a bank there---------linking verb---------is there + a noun.
For be + adv./prep to be located; to be in a place
eg:-The town-----(,)is three miles away.
For be + adv./prep, to happen at a time or in a place:-
eg:-The X'mas party-----(,) is on Saturday evening..
---Hence Most sentences containing (be=is) after the comma are at the entries for the +noun or + adv/prep in the sentences.Find out yourself;.Hope you're successful.

is/are + ...... ing = present continuous tense

He is singing now

She is going to school with her brother now.

你可唔可以俾多啲貼士？
例如呢個文法有沒有特定情況用，或者；
前面個一句，用意係正面定相反意思。

而前面個句會唔會係完整句子。

照我所識，一個英文句子，只可以有一個VERB。
如果逗號後用"IS/ARE"，咁前頭一係就俚語，一係有CONJUNCTION之類。

is / are 後面可以係 :
(1) is / are going
(2) is / are killed
兩種文法用法
(1) 是現在進行式, 說現在去緊
(2) 是被動式, 說前面主詞 (A dog) 被殺了

Hope it may help.

Merry Christmas!